<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">/* 精灵图 */
			div{
				width: 24px;
				height: 24px;
				background-image: url(../src/camera.png);
				background-position: 0 -48px;
			}
			div:hover{/* 伪类选择器 */
				background-position: 0 -72px;
			}
		</style>
	</head>
	<body>
		<div></div>
	</body>
</html>
